Am I correct that once AT&T users upgrade from iOS 8.4.1 to iOS 9.0, they should be able to activate Wi-Fi calling so long as they're on a Mobile Share Value plan? If that's the case, I'm surprised that AT&T hasn't made an official announcement about Wi-Fi calling yet. I'm particularly interested to see how they'll handle Wi-Fi calling while abroad. Is Wi-Fi calling still able to be activated by folks running the GM?